Table-based DPC for grid connected VSC under unbalanced and distorted grid voltages: Review and optimal method

Lee, Sze Sing; Heng, Yeh En

doi:10.1016/j.rser.2017.03.033

Cited by 23 publications

(28 citation statements)

References 55 publications

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“…5 shows a typical control scheme for the grid‐connected mode involving a secondary communication‐based layer. This section summarises the available literature [14, 15, 16, 17, 20, 24, 26, 162, 219, 226–366] on unbalance mitigation in the grid‐connected scenario of both single and multiple inverters.…”

Section: Unbalance Mitigation In the Grid‐connected Modementioning

confidence: 99%

“…A review and comparison of the various approaches for table‐based DPC for grid‐connected inverters, i.e. voltage‐based DPC, resilient voltage‐based DPC, virtual flux‐based DPC (VF‐DPC), and the proposed resilient VF‐DPC is provided in [237], while a new DPC strategy achieving symmetrical grid currents under unbalanced grid voltage is discussed in [14]. An enhanced IPT‐based control is compared for its performance versus a CPT‐based approach in [15] for unbalance compensation.…”

Section: Unbalance Mitigation In the Grid‐connected Modementioning

confidence: 99%

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Unbalance mitigation strategies in microgrids

Vijay

Doolla

Chandorkar

2020

IET Power Electronics

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Unbalance or asymmetry in the distribution network is a well-known power quality issue. In the modern active distribution system, with the increasing penetration of renewables, this phenomenon becomes more pronounced. In the context of microgrids (MGs), several works have been proposed for the management and mitigation of the unbalance, for both the sharing of unbalanced load and maintaining the voltage quality in the islanded mode and for the control of distributed generators in the grid-connected mode during unbalanced conditions. This study comprehensively reviews, summarises, and classifies the various strategies of the unbalance mitigation techniques for the islanded and grid-connected modes of operation for threephase MGs and presents the possible challenges and avenues for future investigations on the topic.

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Section: Unbalance Mitigation In the Grid‐connected Modementioning

confidence: 99%

Section: Unbalance Mitigation In the Grid‐connected Modementioning

confidence: 99%

Unbalance mitigation strategies in microgrids

Vijay

Doolla

Chandorkar

2020

IET Power Electronics

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“…To achieve the constant switching frequency, a modified DTC strategy based on space vector modulation was developed [18], [19]. Based on the DTC strategy concept, the direct power control (DPC) was developed for grid-connected VSCs [20]- [22]. In [20] and [21], a look-up-table (LUT)-DPC was developed, where the proper switching states are selected from a predefined optimal switching table based on the instantaneous errors of active and reactive powers and the angular position of the VSC terminal voltage.…”

mentioning

confidence: 99%

Control of Grid-Connected Voltage-Source Converters: The Relationship Between Direct-Power Control and Vector-Current Control

Gui

Wang

Blaabjerg

et al. 2019

EEE Ind. Electron. Mag.

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This article discusses the mathematical relationship between the grid-voltage-modulated-directpower-control (GVM-DPC) and the vector-current-control (VCC) for three-phase voltage-source-converters (VSCs). It reveals that the GVM-DPC is equivalent to the VCC at the steady-state, yet presents a superior transient performance by removing the need of phase-locked loop (PLL). That means the GVM-DPC solves the disadvantage of conventional DPC such as poor steady-state performance. Moreover, the GVM-DPC will reduce the computational burden in comparison with the VCC due to the absence of Park transformation and PLL. Consequently, we can expect that the GVM-DPC method has a good capability of plug-and-play for the VSC. Finally, the experiment results match the theoretical expectations closely. Index Terms Direct power control, vector current control, voltage source converters, phase-locked loop. I. INTRODUCTION OF CONTROL OF GRID-CONNECTED VOLTAGE-SOURCE CONVERTERS Voltage source converter (VSC) is widely used in the application of smart grid, flexible AC transmission systems, and renewable energy sources (e.g., wind and solar) [1]-[6]. Various control methods are researched for VSC to improve its performance, stability, and robustness [7].

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“…Table 2, the THD of the currents is different for each condition of the applied voltages. The more unbalance in grid voltage, the more increase in THD we get, however it is not affected by the harmonic content in voltage as mentioned in [9].…”

Section: Modeling Of Pmsg the Model Of Pmsg In D−q Transformation Ismentioning

confidence: 94%

“…5) shows that the new algorithm responds faster than traditional control. The active and instantaneous reactive powers are observed in the (power observer block) by the measurement of the line current and the observation of the virtual flux components in equation [9]. Instant active and reactive powers can be estimated as…”

Section: Modeling Of Pmsg the Model Of Pmsg In D−q Transformation Ismentioning

confidence: 99%

Sensorless Direct Power Control for Three-Phase Grid Side Converter Integrated Into Wind Turbine System Under Disturbed Grid Voltages

Boukhechem

Boukadoum

Boukelkoul

et al. 2020

Electrical Engineering &Amp; Electromechanics

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Wind turbines with permanent magnet synchronous generator (PMSG) are widely used as sources of energy connected to a grid. The studied system is composed of a wind turbine based on PMSG, a bridge rectifier, a boost converter, and a controlled inverter to eliminate low-order harmonics in grid currents under disturbances of grid voltage. Traditionally, the grid side converter is controlled by using the control VFOC (Virtual Flux Oriented Control), which decouple the three-phase currents indirect components (id) and in quadratic (iq) and regulate them separately. However, the VFOC approach is dependent on the parameters of the system. This paper illustrates a new scheme for the grid-connected converter controller. Voltage imbalance and harmonic contents in the three-phase voltage system cause current distortions. Hence, the synchronization with the network is an important feature of controlling the voltage converter. Thus, a robust control method is necessary to maintain the adequate injection of the power during faults and/or a highly distorted grid voltage. The proposed new control strategy is to use the direct power control based virtual flux to eliminate side effects induced by mains disturbances. This control technique lowers remarkably the fluctuations of the active and reactive power and the harmonic distortion rate. The estimated powers used in the proposed control approach is calculated directly by the positive, negative, and harmonic items of the estimated flux and the measured current without line sensor voltage. References 27, tables 6, figures 13.

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Table-based DPC for grid connected VSC under unbalanced and distorted grid voltages: Review and optimal method

Cited by 23 publications

References 55 publications

Unbalance mitigation strategies in microgrids

Unbalance mitigation strategies in microgrids

Control of Grid-Connected Voltage-Source Converters: The Relationship Between Direct-Power Control and Vector-Current Control

Sensorless Direct Power Control for Three-Phase Grid Side Converter Integrated Into Wind Turbine System Under Disturbed Grid Voltages

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